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active memory defragmentation

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This commit is contained in:
oranagra
2016-12-30 03:37:52 +02:00
committed by antirez
parent b4f3c5a499
commit 67def2611f
13 changed files with 755 additions and 8 deletions
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32
deps/jemalloc/src/jemalloc.c vendored
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@ -2591,3 +2591,35 @@ jemalloc_postfork_child(void)
}
/******************************************************************************/
/* Helps the application decide if a pointer is worth re-allocating in order to reduce fragmentation.
* returns 0 if the allocation is in the currently active run,
* or when it is not causing any frag issue (large or huge bin)
* returns the bin utilization and run utilization both in fixed point 16:16.
* If the application decides to re-allocate it should use MALLOCX_TCACHE_NONE when doing so. */
JEMALLOC_EXPORT int JEMALLOC_NOTHROW
je_get_defrag_hint(void* ptr, int *bin_util, int *run_util) {
int defrag = 0;
arena_chunk_t *chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(ptr);
if (likely(chunk != ptr)) { /* indication that this is not a HUGE alloc */
size_t pageind = ((uintptr_t)ptr - (uintptr_t)chunk) >> LG_PAGE;
size_t mapbits = arena_mapbits_get(chunk, pageind);
if (likely((mapbits & CHUNK_MAP_LARGE) == 0)) { /* indication that this is not a LARGE alloc */
arena_t *arena = extent_node_arena_get(&chunk->node);
size_t rpages_ind = pageind - arena_mapbits_small_runind_get(chunk, pageind);
arena_run_t *run = &arena_miscelm_get(chunk, rpages_ind)->run;
arena_bin_t *bin = &arena->bins[run->binind];
malloc_mutex_lock(&bin->lock);
/* runs that are in the same chunk in as the current chunk, are likely to be the next currun */
if (chunk != (arena_chunk_t *)CHUNK_ADDR2BASE(bin->runcur)) {
arena_bin_info_t *bin_info = &arena_bin_info[run->binind];
size_t availregs = bin_info->nregs * bin->stats.curruns;
*bin_util = (bin->stats.curregs<<16) / availregs;
*run_util = ((bin_info->nregs - run->nfree)<<16) / bin_info->nregs;
defrag = 1;
}
malloc_mutex_unlock(&bin->lock);
}
}
return defrag;
}